EP2530433B1 - Verfahren zur Erzeugung einer Datenbank für eine Navigationsvorrichtung - Google Patents

Verfahren zur Erzeugung einer Datenbank für eine Navigationsvorrichtung Download PDF

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Publication number
EP2530433B1
EP2530433B1 EP20110168539 EP11168539A EP2530433B1 EP 2530433 B1 EP2530433 B1 EP 2530433B1 EP 20110168539 EP20110168539 EP 20110168539 EP 11168539 A EP11168539 A EP 11168539A EP 2530433 B1 EP2530433 B1 EP 2530433B1
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Prior art keywords
road
dimensional
dimensional road
vector
vectors
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English (en)
French (fr)
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EP2530433A1 (de
Inventor
Marek Strassenburg-Kleciak
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Harman Becker Automotive Systems GmbH
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Harman Becker Automotive Systems GmbH
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Priority to EP20110168539 priority Critical patent/EP2530433B1/de
Priority to CN201280026885.1A priority patent/CN103562681B/zh
Priority to US14/122,843 priority patent/US9574897B2/en
Priority to PCT/EP2012/060232 priority patent/WO2012164010A1/en
Publication of EP2530433A1 publication Critical patent/EP2530433A1/de
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
    • G01C21/34—Route searching; Route guidance
    • G01C21/36—Input/output arrangements for on-board computers
    • G01C21/3626—Details of the output of route guidance instructions
    • G01C21/3635—Guidance using 3D or perspective road maps
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/38—Electronic maps specially adapted for navigation; Updating thereof
    • G01C21/3804—Creation or updating of map data
    • G01C21/3807—Creation or updating of map data characterised by the type of data
    • G01C21/3815—Road data
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/38—Electronic maps specially adapted for navigation; Updating thereof
    • G01C21/3804—Creation or updating of map data
    • G01C21/3807—Creation or updating of map data characterised by the type of data
    • G01C21/3826—Terrain data
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/38—Electronic maps specially adapted for navigation; Updating thereof
    • G01C21/3863—Structures of map data
    • G01C21/3867—Geometry of map features, e.g. shape points, polygons or for simplified maps
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
    • G01C21/38—Electronic maps specially adapted for navigation; Updating thereof
    • G01C21/3863—Structures of map data
    • G01C21/387—Organisation of map data, e.g. version management or database structures
    • G01C21/3878—Hierarchical structures, e.g. layering
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/21—Design, administration or maintenance of databases
    • G06F16/211—Schema design and management
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
    • G06T17/05—Geographic models

Definitions

  • the invention relates to methods and devices associated with the outputting of three-dimensional maps by a navigation device.
  • the invention relates in particular to a method of generating a database for a navigation device.
  • Optical output devices are widely used in navigation devices. Such output devices may be used for outputting electronic maps. Since electronic maps may be displayed on screens of small and/or portable devices, they have the advantage of being versatile and compact.
  • Three-dimensional (3D) maps i.e. perspective representations
  • the recognition of an environmental region, such as a street intersection, may be facilitated when a three-dimensional map is output, as compared to a conventional two-dimensional representation.
  • DTM data may be stored in the navigation device.
  • the navigation device may compute a projection of the two-dimensional road vectors of a conventional digital map onto the surface defined by the DTM data at run time.
  • EP 1 107 189 A2 which serves as basis for the preamble of the independent claims, EP 1 672 591 A2 , and US 6 169 516 B1 respectively disclose navigation systems in which the navigation system computes a projection of a two-dimensional road vector of a conventional digital map onto the surface defined by the DTM data at run time.
  • EP 1 584 897 A2 discloses a navigation apparatus in which altitude information of points is selectively stored to reduce an amount of stored data.
  • EP 1 750 238 A1 discloses a map creation device which creates three-dimensional map information. Data may be processed such that a three-dimensional on-ground structure object may be superimposed on a three-dimensional ground object.
  • WO 2008/120211 A1 and EP 1 503 347 A2 respectively disclose devices for displaying electronic maps.
  • a method of generating a database for a navigation device is provided.
  • a plurality of two-dimensional road vectors are retrieved from a 2D map database, with each one of the two-dimensional road vectors defining a road segment of a road network.
  • Digital terrain model data defining a three-dimensional surface are retrieved.
  • a projection of the two-dimensional road vector onto the three-dimensional surface along a pre-defined projection direction is established.
  • at least one three-dimensional road vector is determined based on the established projection, the at least one three-dimensional road vector including height information for points located on the at least one three-dimensional road vector.
  • the at least one three-dimensional road vector is stored in the database.
  • the steps for generating the database are performed before the database is deployed to a navigation device.
  • a database which includes three-dimensional road vectors i.e. road vectors which include height information
  • Conventional 2D map data which do not include height information for the points located on road segments are pre-processed to generate a database which includes such height information for road segments.
  • This allows computationally costly steps, such as projecting two-dimensional road vectors onto a three-dimensional surface, to be performed in a pre-processing phase in which the database is generated. It is then no longer required to perform such projection steps at run time, when the navigation device outputs a 3D map.
  • the requirements imposed on computational resources and/or computation time for generating the 3D map in the navigation can be reduced.
  • the projection direction corresponds to the direction parallel to the gravity vector.
  • This axis will also be referred to as z-axis.
  • the height information may be a coordinate along the projection direction and will also be referred to as z-coordinate.
  • the three-dimensional road vector(s) may have various data formats. For illustration, a coordinate 3-tuple representing the (x, y, z)-coordinates of the starting point and another coordinate 3-tuple representing the (x, y, z)-coordinates of the endpoint of the three-dimensional road vector may be determined. Other representations are possible. For illustration, a coordinate 3-tuple representing the (x, y, z)-coordinate triple of one of the starting point or endpoint in combination with a pair of angles defining the orientation of the 3D road vector and a length of the 3D road vector may be determined and stored in the database.
  • a distance of the intermediate point from a straight line passing through an initial point of the projection and an endpoint of the projection may respectively be determined.
  • the distance is respectively determined in the conventional manner as length of a line oriented perpendicularly to the straight line which passes from the respective intermediate point to the straight line.
  • the number of three-dimensional road vectors required to describe the road segment with a given accuracy may be selected accordingly.
  • the number of three-dimensional road vectors, and thus the storage space required for the database may be kept moderate by using the distance of the intermediate points from the straight line to selectively generate additional three-dimensional road vectors.
  • a threshold comparison may respectively be performed for such a distance, and the at least one three-dimensional road vector may be determined based on the threshold comparison. Thereby, the number of three-dimensional road vectors required to describe the road segment may be adjusted based on the threshold comparison. If the determining of three-dimensional road vectors is performed several times for several different levels of detail, the threshold may be selected based on the level of detail.
  • More than one three-dimensional road vector may be selectively determined for a two-dimensional road vector if, for an intermediate point, the distance is greater than the threshold. Thereby, the number of three-dimensional road vectors generated for one two-dimensional road vector may be selectively increased when required to accommodate unevenness of the terrain.
  • the three-dimensional surface defined by the digital terrain model data may include a plurality of facets.
  • the plurality of facets may be triangular facets of an irregular triangulated network (INT).
  • the plural intermediate points may include points of the projection located on boundaries between facets. Using such intermediate points for performing the threshold comparison, the unevenness of the terrain may be efficiently accounted for.
  • Modified digital terrain model data are generated based on the digital terrain model data and based on the determined at least one three-dimensional road vector.
  • the modified digital terrain model data may be stored in the database before the database is deployed to the navigation device.
  • Generating the modified digital terrain model data may include a re-triangularization performed based on the three-dimensional road vectors and, optionally, other quantities such as road widths.
  • Information on a road width may respectively be retrieved for the plurality of two-dimensional road vectors.
  • the at least one three-dimensional road vector and the modified digital terrain model data may be determined based on the information on a road width.
  • Information on the road width may respectively be retrieved by determining a road class of the respective road segment.
  • the road class may, for illustration, be a function road class.
  • Road classifications are generally available for the 2D map database from which the two-dimensional road vectors are retrieved and may be utilized in determining the at least one three-dimensional road vector and/or for defining new triangular facets for the modified digital terrain model data.
  • the road width can be determined from the road class stored for the respective road segment in the 2D map database.
  • a line extending on the road surface in a direction normal to the three-dimensional vector for the road segment is normal to the projection direction; i.e., such a line extends horizontally. Areas at which two or more road segments meet are horizontal. I.e., such areas may be defined as planar polygons oriented perpendicularly to the projection direction.
  • Generating the modified digital terrain model data includes determining, for each one of the determined three-dimensional road vectors, a triangular facet in which the respective three-dimensional road vector extends and which has an edge normal to both the three-dimensional road vector and the projection direction.
  • the realistic constraint may be enforced that a vector extending across the surface of a road segment, which is normal to the longitudinal direction of the road segment (i.e., to the three-dimensional road vector), is oriented horizontally. I.e., such a vector extending across the surface of a road segment may thus be enforced to be parallel to the x-y-plane.
  • nodes of the road network to which respectively at least a first two-dimensional road vector and a second two-dimensional road vector are connected may be identified.
  • a planar polygon oriented normal to the projection direction may be determined such that a first three-dimensional road vector determined for the first two-dimensional road vector and a second three-dimensional road vector determined for the second two-dimensional road vector are arranged within the polygon.
  • a transition area which is parallel to the x-y-plane may be implemented at the nodes at which at least two road segments meet. Artefacts that could otherwise be present at such nodes may be mitigated or eliminated.
  • a corner of the polygon may be determined by computing three spatial coordinates of an intersection point of a first road boundary determined for the first two-dimensional road vector and of a second road boundary determined for the second two-dimensional road vector.
  • Such an intersection point may be readily determined as intersection point of lines which extend parallel to the direction vectors of the respective three-dimensional road vector and are offset therefrom in a direction parallel to the x-y-plane.
  • Equation (1) By intersecting two lines having the form given by Equation (1), which correspond to road boundaries of different road segments, the height (z-coordinate) of the planar polygon may be determined.
  • a subset of edges of the polygon may respectively be oriented such that each edge of the subset is normal to the projection direction and respectively one of the two-dimensional road vectors connected to the respective node. Thereby, a smooth transition from the road segment to the transition or junction area defined by the polygon may be ensured.
  • the nodes for which a planar polygon normal to the projection direction is determined may include road junctions to which more than two two-dimensional road vectors are connected. By introducing such horizontal planar areas at junctions, artefacts that could occur in perspective views may be mitigated or eliminated.
  • the database may be a relational database. Coordinates of the initial point and/or endpoint of a three-dimensional road vector may be stored as attributes of a road segment in the relational database.
  • the database may be a map database in accordance with the Navigation Data Standard (NDS).
  • NDS Navigation Data Standard
  • a database generated using a method of generating a database according to any one aspect or embodiment is provided.
  • the database generated with the method according to an embodiment may be used in a method of outputting a three-dimensional map via an optical output device of a navigation device.
  • a database storing digital terrain model data and three-dimensional road vectors is accessed.
  • the three-dimensional road vectors represent road segments of a road network and include height information.
  • At least one three-dimensional road vector may be retrieved.
  • the optical output device is controlled so as to generate a perspective view of at least one road segment represented by the at least one three-dimensional road vector based on the retrieved at least one three-dimensional road vector and independently of the digital terrain model data.
  • a database storing road vectors as three-dimensional vectors is used in the navigation device. This allows perspective views of road segments to be generated directly based on the three-dimensional road vectors. It is not required to compute a projection of two-dimensional road vectors onto a surface defined by a digital terrain model at run time.
  • the database used in this method is the database generated using the method of generating a database according to any one aspect or embodiment.
  • the digital terrain model data of the database used in the method of displaying the three-dimensional map may correspond to the "modified digital terrain model data" as mentioned in the context of the method of generating the database. I.e., consistency between the digital terrain model data and the three-dimensional road vectors may be ensured.
  • the method may include generating a perspective view of terrain surrounding the road segments.
  • the perspective view of the terrain may be generated based on digital terrain model data retrieved from the database.
  • the height information of the three-dimensional road vectors may be discarded.
  • the two-dimensional map may be generated by using the x- and y-coordinates of initial points and endpoints of three-dimensional road vectors, but not the z-coordinates.
  • the database generated with the method according to an embodiment may be used in a navigation device.
  • the navigation device comprises an optical output device, a database and a processing device.
  • the database stores digital terrain model data and three-dimensional road vectors.
  • the three-dimensional road vectors respectively represent road segments of a road network and include height information.
  • the processing device is coupled to the optical output device and to the database.
  • the processing device is configured to retrieve at least one three-dimensional road vector from the database and to control the optical output device to generate a perspective view of at least one road segment represented by the at least one three-dimensional road vector based on the retrieved at least one three-dimensional road vector and independently of the digital terrain model data.
  • This navigation device has a database storing road vectors as three-dimensional vectors. This allows perspective views of road segments to be generated directly based on the three-dimensional road vectors. It is not required to compute a projection of two-dimensional road vectors onto a surface defined by a digital terrain model at run time.
  • the database used in this method is the database generated using the method of generating a database according to any one aspect or embodiment.
  • the digital terrain model data of the database used in the method of displaying the three-dimensional map may correspond to the "modified digital terrain model data" as mentioned in the context of the method of generating the database. I.e., consistency between the digital terrain model data and the three-dimensional road vectors may be ensured.
  • the processing device may be configured to generate a perspective view of terrain surrounding the road segments based on digital terrain model data retrieved from the database.
  • the navigation device may be a vehicle navigation device.
  • the vehicle navigation device may be removably or fixedly installed in a vehicle.
  • aspects and embodiments may be used for databases used for outputting three-dimensional maps, in particular in vehicle navigation devices.
  • Fig. 1 schematically illustrates a navigation device 1.
  • the navigation device 1 comprises a processing device 2 controlling the operation of the navigation device 1.
  • the processing device 2 may comprise a central processing unit, for example including one or more microprocessors, digital signal processors or application-specific integrated circuits.
  • the processing device 2 may also include a graphics processor.
  • the navigation device 1 further includes a database stored in a storage device 3.
  • the storage device 3 may comprise any one, or any combination, of various types of memory, such as random access memory, flash memory or a hard drive, but also removable memories such as a compact disk (CD), a DVD, a memory card or the like.
  • the navigation device 1 also includes an optical output device 4.
  • the navigation device 1 may also include an input interface 5.
  • the navigation device 1 may include additional components, such as a position sensor and/or a wireless receiver.
  • the position sensor may be adapted to determine the current position of a vehicle in which the navigation device 1 is installed.
  • the position sensor may comprise a GPS (Global Positioning System) sensor, a Galileo sensor, a position sensor based on mobile telecommunication networks or the like.
  • the wireless receiver may be configured to receive information for updating the database stored in the storage device 3.
  • the storage device 3 stores a database comprising map data in which road vectors representing road segments are stored.
  • the road vectors are stored as three-dimensional road vectors. I.e., the road vectors are stored in a format which allows three spatial coordinates (x, y, z) of points located on the respective road vector to be determined.
  • the three-dimensional road vector(s) may have any one of various data formats. For illustration, a coordinate 3-tuple representing the (x, y, z)-coordinates of the starting point and another coordinate 3-tuple representing the (x, y, z)-coordinates of the endpoint of the three-dimensional road vector may be stored in the database. Other representations are possible.
  • a coordinate 3-tuple representing the (x, y, z)-coordinates of one of the starting point or endpoint in combination with a pair of angles defining the orientation of the 3D road vector and a length of the 3D road vector may be stored in the database.
  • the database may also include digital terrain model data which may be used for generating a three-dimensional map which includes a perspective view of terrain surrounding road segments.
  • the processing device 2 is configured to generate a perspective view of road segments based on the three-dimensional road vectors stored in the storage device 3.
  • the generation of the perspective view of the road segments may be directly based on the three-dimensional road vectors stored in the database, without having to compute a projection of the three-dimensional road vectors onto a surface defined by the digital terrain model.
  • the processing device 2 may retrieve the digital terrain model data to generate a perspective view of terrain surrounding road segments.
  • the three-dimensional road vectors stored in the database of the navigation device 1 may be generated before the database is stored in the navigation device 1. Methods of generating the database will be explained in more detail with reference to Figs. 3 and 5-16 below.
  • the database with the three-dimensional road vectors may be deployed to the navigation device in various ways and as various times.
  • the database or part of the database may be stored in the navigation device 1 after assembly and before use of the navigation device 1.
  • the database or part of the database may be stored in the navigation device 1 in an update procedure.
  • Such an update procedure may include wired or wireless transfer of three-dimensional road vectors to the navigation device to accommodate changes in the road network in an update of the navigation device database.
  • the database stored in the memory 3 may include different logical layers, as will be explained in more detail with reference to Fig. 2 . Additionally, the database may be split into different blocks which are associated with different update regions or tiles of a tiling. Such a structure facilitates performing updates. This is particularly desirable for performing updates of the database to adjust the database to local changes, for example to new roads or reconstructed roads. Such updates may then be performed by updating only the update regions or tiles affected by changes in the road network. This allows the updates to be more readily performed in a more time-efficient manner or as over-the-air updates.
  • Fig. 2 is a schematic representation of a map database 10.
  • a map database 10 having the structure explained in the following may be stored in the storage device 3 of the navigation device 1.
  • the map database 10 includes a plurality of layers 11-15.
  • the layers may include a routing layer 11 which stores the information required for performing route searches and a guidance layer 12 which stores data required for route guidance.
  • the map database 10 may include additional layers 13-15.
  • a name layer 13 may includes references to road names, house numbers or similar.
  • a point of interest (POI) layer 14 may include information on points of interest.
  • An Advanced Driver Assistance System (ADAS) layer 15 may include data for Advanced Driver Assistance. Additional or alternative layers may be provided, such as a truck layer including specific information for trucks or lorries, a layer for phonetic representations, or a layer for basic map display.
  • the map database 10 may be configured as a relational database. At least one of the layers of the database, such as the routing layer 11 or the guidance layer 12, may include three-dimensional road vectors.
  • the digital map data may be stored in the guidance layer 12, the POI layer 14, or another suitable layer, or in plural such layers.
  • Fig. 3 is a flow chart of a method 20 of generating a database which includes three-dimensional road vectors.
  • the method 20 may be performed by an electronic computing device which is separate from the navigation device.
  • the database generated by the electronic computing device with the three-dimensional road vectors included therein may be deployed to plural navigation devices for use in generating three-dimensional optical output.
  • conventional map data in which road segments are represented by two-dimensional road vectors representing road segments are processed using digital terrain model (DTM) data to generate three-dimensional road vectors.
  • the three-dimensional road vectors include information on a height-coordinate of the initial points and endpoints and, thus, all intermediate points on the respective road vector.
  • the three-dimensional road vectors include information on the z-coordinate.
  • the z-direction points along the gravity vector such that the three-dimensional road vectors may be respectively defined in terms of 3-tuples (xA, yA, zA) of coordinates of an initial point and (xB, yB, zB) of coordinates of an endpoint.
  • the two-dimensional road vectors are projected onto a three-dimensional surface defined by the DTM data.
  • the height values, i.e., the z-coordinates, may then be determined based on the projection.
  • the direction of the gravity vector, and thus the projection direction used to convert two-dimensional road vectors into three-dimensional road vectors may vary locally. While such changes may be negligible for certain road networks, they can be easily accounted for by allowing the x-, y-, and z-axes to have locally varying directions. Such local changes are negligible for characteristic dimensions of road segments as used in navigation devices and will not be discussed in detail below. However, any reference to x-, y-, and z-axes, or to a projection direction, may take into account local variations of the respective coordinate axes and directions.
  • a two-dimensional road vector is retrieved from a conventional map database in which the road vectors are stored as two-dimensional vectors which do not include information on a height difference between the initial point and endpoint of the respective vector. Additional information may be retrieved from the map database, such as information on a road class or on a number of lanes of the road segment represented by the retrieved two-dimensional road vector. The information on the road class or number of lanes may be used to estimate a width of the road segment. The width of the road segment may be used to determine three-dimensional road vectors in a neighbourhood of a node of the road network.
  • DTM data are retrieved for at least an environment of the road vector.
  • the DTM data may define an irregular triangulated network (ITN).
  • the DTM data may also have any other suitable format which provides height information as a function of a coordinate 2-tuple which defines a position in a plane orthogonal to the gravity vector.
  • the DTM data define a three-dimensional surface.
  • the two-dimensional road vector is projected onto the three-dimensional surface defined by the DTM data.
  • the resulting projection will be a line which is not straight.
  • the projection may include a sequence of line segments, the orientation of adjacent line segments changing at a boundary between triangular facets of the ITN.
  • At 24 at least one three-dimensional road vector is determined based on the projection. Determining the at least one three-dimensional road vector may include various processing operations, as will be explained in more detail with reference to Figs. 5-16 .
  • a number of three-dimensional road vectors which need to be determined to represent the projection may be selected so as to ensure that the distance between points located on the three-dimensional road vectors and the three-dimensional surface is smaller than a threshold value.
  • three-dimensional road vectors which are oriented perpendicularly to the projection direction may be introduced at nodes where several of the two-dimensional road networks are connected to each other.
  • the generation of at least one three-dimensional road vector for a given two-dimensional road vector may be performed further in dependence on another two-dimensional road vector which is connected to the two-dimensional road vector retrieved at 21 at a node.
  • Generating at least one three-dimensional road vector at 24 may include determining a width of the road segment represented by the retrieved two-dimensional road vector and a width of another road segment represented by another two-dimensional road vector connected to the two-dimensional road vector retrieved at 21 at a node of the road network.
  • Step 25 it is determined whether another two-dimensional road vector is to be processed so as to generate at least one three-dimensional road vector. If there is another two-dimensional road vector, the method may return to 21. Steps 21-25 may then be repeated with the next two-dimensional road vector.
  • steps 21-24 have already been performed for all two-dimensional road vectors for which it is desired to determine at least one three-dimensional road vector, at 26, the three-dimensional road vectors determined for the various two-dimensional road vectors are stored in the database.
  • the processing described for method 20 may be performed for each one of these levels.
  • Both the map data including the two-dimensional road vectors and the DTM may vary from one level of detail to another level of detail.
  • determining the at least one three-dimensional road vector may also be performed in parallel for several two-dimensional road vectors.
  • the method also includes generating modified DTM data, in order to ensure consistency between the determined three-dimensional road vectors and the surrounding terrain.
  • the modified DTM data may also be stored in the database.
  • the database generated using the method 20 may subsequently be deployed to a navigation device.
  • the same database including three-dimensional road vectors will be used in a large number of navigation devices.
  • height information for road segments being determined in the method 20 it is no longer required to project two-dimensional road vectors onto a three-dimensional surface when a perspective view is to be generated in a navigation device which operates using the database.
  • Fig. 4 is a flow chart of a method 30 of outputting a three-dimensional map via an optical output device.
  • the method 30 may be performed by the processing device 2 of the navigation device 1, in order to output a three-dimensional map, i.e. a perspective view, via the optical output device 4.
  • the method 30 uses a database which stores three-dimensional road vectors.
  • the database may also include DTM data.
  • each one of the three-dimensional road vectors includes height information which specifies the direction of a road segment represented by the three-dimensional road vector in the height direction, i.e., in the direction parallel to the gravity vector.
  • one or several three-dimensional road vectors are retrieved from the database. Additional information may be retrieved, such as information on a road class or number of lanes of the respective road segment represented by the three-dimensional road vector(s). Such information may be used to determine the road width.
  • a perspective view of a road segment is generated based on the three-dimensional road vector(s).
  • the perspective view of the road segment is generated independently of the DTM data stored in the database.
  • Other data such as information on a road class or number of lanes may be used when generating the perspective view of the road segment.
  • a perspective view of terrain surrounding the road segment may also be generated.
  • This perspective view may be generated based on the DTM data. Since the DTM data defines the surface profile, it is again not required to compute any projections of lines onto the three-dimensional surface defined by the DTM data in order to generate a perspective view of the terrain surrounding the road segment.
  • Fig. 5 is a flow chart of the procedure 40.
  • Figs. 6-16 are illustrative views to which reference will be made for explaining steps of the procedure 40 with reference to exemplary two-dimensional road vectors and DTM data.
  • the procedure 40 may be used to implement step 24 of the method 20 of Fig. 3 .
  • the procedure is automatically performed by an electronic computation device, based on a digital map having two-dimensional road vectors and DTM data.
  • the procedure described with reference to Figs. 5-16 for determining the three-dimensional road vectors operates based on several assumptions. Namely, it is assumed that a vector extending perpendicular to a longitudinal axis of a road segment (which corresponds to a three-dimensional road vector) and extending within the plane of the road segment is horizontal and thus perpendicular to the projection direction. It is further assumed that areas at which two or more two-dimensional road vectors are connected to each other are horizontal, i.e. perpendicular to the projection direction. While these are realistic assumptions for most road networks, other constraints may be used in other embodiments.
  • intermediate points located on the projection are determined.
  • the intermediate points are spaced from the initial point and endpoint of the projection.
  • the intermediate points may be, or may at least include, points at which the projection traverses a boundary between triangular facets of the ITN.
  • intermediate points may be selectively discarded for generating the at least one three-dimensional road vector.
  • the projection on the three-dimensional surface is composed of a series of line segments when the DTM data defines an ITN, such that the projection could be identically represented by a set of three-dimensional road vectors, which is equal in number to the number of different triangular facets of the ITN on which the projection is located. It is possible to reduce the number of three-dimensional road vectors by tolerating a deviation between the three-dimensional road vectors and the three-dimensional surface which is less than or equal to a pre-determined threshold.
  • One three-dimensional road vector may be sufficient to describe line segments extending on different triangular facets of the ITN, provided that the orientation of the triangular facets does not exhibit too significant changes from one facet to another facet. Where the facet plane changes significantly, another three-dimensional road vector needs to be defined.
  • the distance of the intermediate points determined at 41 from a straight line passing through the initial point of the projection and the endpoint of the projection may be determined.
  • the distance may be compared to a threshold. If the distance is less than or equal to the threshold, it is not required to define a separate vector terminating at the intermediate point.
  • steps 41 and 42 will be illustrated in more detail.
  • Fig. 6 shows a plan view of a two-dimensional road vector 66.
  • a three-dimensional surface in the form of an ITN is also shown in plan view.
  • the ITN includes triangular facets 61-65.
  • the projection of the two-dimensional road vector onto the three-dimensional surface defined by the DTM data has an initial point A and an endpoint B. While shown in a plan view in Fig. 6 , all three coordinates of points A and B are known when the two-dimensional road vector is projected onto the three-dimensional surface.
  • Intermediate points P 1 , P 2 , P 3 , and P 4 are the points at which the projection traverses a boundary between triangular facets. All three coordinates of each one of the intermediate points may be determined.
  • intermediate points located on boundaries between facets it is sufficient to perform the threshold comparison described below for intermediate points located on boundaries between facets.
  • the intermediate points may be selected according to other criteria. For illustration, intermediate points having a given fixed spacing may be considered.
  • Fig. 7 shows a side view in a drawing plane which is spanned by the two-dimensional road vector 66 and a vector 71 pointing along the projection direction.
  • the plane normal to the vector 71 which points along the projection direction is also referred to as x-y-plane herein, while the direction in which vector 71 points is also referred to as z-direction, which is parallel to the gravity vector.
  • the projection of the two-dimensional road vector onto the triangular facets of the ITN includes linear segments 72, 73.
  • the selecting at step 42 may be implemented such that, for the intermediate points, the distance of the respective intermediate point from the straight line 74 between the initial point A of the projection and the endpoint B of the projection is determined. Thereby, the intermediate points are identified which are not located within a corridor defined by the lines 76 and 77 which extend parallel to the straight line 74.
  • the lines 76 and 77 are offset from the straight line 74 in a direction normal to the straight line 74, by a threshold distance 75.
  • the threshold distance 75 defines the width of the corridor and thus the deviation between the straight line 74 and the three-dimensional surface which is considered acceptable.
  • the threshold distance 75 may be selected based on the level of detail of the map for which the three-dimensional road vectors are respectively determined.
  • an intermediate point P i is exemplarily shown to be located outside of the corridor. I.e., the distance of P i from the straight line 74 is greater than the threshold distance 75. All other intermediate points are located within the corridor having a width given by the threshold distance 75. Therefore, with the exception of intermediate point P i it is not required to define a dedicated three-dimensional road vector terminating at the respective intermediate point.
  • Fig. 8 illustrates the resulting set of two three-dimensional road vectors 78 and 79 which results in such a case.
  • One three-dimensional road vector 78 determined for the two-dimensional road vector 66 has the initial point A of the projection as initial point and the intermediate point P i having a distance of greater than the threshold from the straight line 74 as endpoint.
  • the other three-dimensional road vector 79 determined for the two-dimensional road vector 66 has the intermediate point P i as initial point and the endpoint B of the projection as endpoint.
  • an intermediate point P j may be determined such that all intermediate points P 1 , ... , P j-1 are located at a distance of less than the threshold from a straight line passing through the initial point A of the projection and P j , but for which the distance of P j from the straight line passing through the initial point A and the next intermediate point P j+1 is greater than the threshold. Then, a first three-dimensional road vector may be defined from the initial point A to the thus identified intermediate point P j .
  • this procedure may be repeated by identifying an intermediate point P k with k>j such that all intermediate points P j+1 , ..., P k-1 are located at a distance of less than the threshold from a straight line passing through P j and P k , but for which the distance of P k from the straight line passing through P j and the next intermediate point P k+1 is greater than the threshold.
  • the next three-dimensional road vector is then defined as vector having P k as initial point and P j as endpoint. The procedure may be repeated until the endpoint B of the projection is reached.
  • the number of three-dimensional road vectors may be kept moderate. Storage space requirements may thereby be reduced.
  • Fig. 9 shows a plan view of a road network with several two-dimensional road vectors.
  • the projection of a two-dimensional road vector terminates at A.
  • the projection of another two-dimensional road vector starts at A and terminates at B.
  • the projection of yet another two-dimensional road vector starts at B.
  • intermediate points located on boundaries between facets of the ITN are determined.
  • Intermediate points located by within the corridor explained with reference to Fig. 7 are indicated by open circles and may be disregarded when defining three-dimensional road vectors.
  • Intermediate points located outside the corridor, such as intermediate point P i are indicated with full circles. Such intermediate points are taken into account when defining three-dimensional road vectors.
  • a three-dimensional road vector terminates at A.
  • Another three-dimensional road vector 78 has A as starting point and P i as endpoint.
  • Another three-dimensional road vector 79 has P i as starting point and B as endpoint.
  • Another three-dimensional road vector 82 has B as starting point and P k as endpoint.
  • Another three-dimensional road vector 83 has P k as starting point.
  • the two three-dimensional road vectors 78 and 79 are both determined for the same two-dimensional road vector.
  • the two three-dimensional road vectors 82 and 83 are both determined for the same two-dimensional road vector.
  • Additional three-dimensional road vectors may be defined in proximity to the points A and B which correspond to nodes to which two or more two-dimensional road vectors are connected. These additional three-dimensional road vectors may be defined to have an orientation which is perpendicular to the projection direction 71. I.e., these three-dimensional road vectors may extend horizontally.
  • the height value, i.e. z-coordinate, and length of such horizontal road vectors may be determined based on the two-dimensional road vectors connected to the node, the DTM data and additionally information on a road width for the road segments represented by the two-dimensional road vectors.
  • the information on the road width may be used for defining transition areas or junction areas at nodes of the road network to which at least two two-dimensional road vectors are connected.
  • the information on the road width may be a road class.
  • road classifications such as functional road classes (FRC) are known and used in conventional map data bases.
  • FRC functional road classes
  • the road width may be estimated, owing to the fact that roads which are more important for long-distance travel are generally wider than local roads.
  • the information on the road width may also include a number of lanes of the road. Using this information, the road width may also be estimated.
  • a node of the road network is identified to which the two-dimensional road vector is connected. If there are plural such nodes, steps 44-49 may be performed for each one of the nodes. If a road segment represented by a two-dimensional vector is not a dead-end road, the road segment will generally be connected to a node at either one of its ends.
  • additional three-dimensional road vectors may be defined to mitigate artefacts at transitions between three-dimensional road vectors which, in plan view, have different orientations when projected into the x-y-plane.
  • a horizontal closed planar polygon is determined.
  • the height value for the polygon i.e., the z coordinate value, is determined by computing an intersection point between outer boundaries of two road segments.
  • Three-dimensional road vectors located within the planar polygon are defined, the orientation in the x-y-plane corresponding to that of the associated two-dimensional road vector.
  • At least some edges of the closed polygon may be determined by lines which have the z-value determined for the closed polygon and extend normal to the three-dimensional road vectors.
  • a horizontal transition area is determined in the area of the node.
  • the horizontal transition area has a boundary which is a closed polygon.
  • the horizontal transition area is oriented perpendicularly to the projection direction.
  • the z-coordinate value of the horizontal transition area may be determined by computing the intersection point between outer road boundaries of the two road segments connected to the node.
  • the parameterization does not need to be limited to the interval ⁇ 1 ⁇ [0, l 1 ].
  • the height value, i.e. z-coordinate, of the closed polygon is determined by computing the intersection point of the lines defined by equations (2) and (3).
  • the z-coordinate value for the polygon may be dependent on the widths of the road segments d 1 and d 2 .
  • a three-dimensional road vector is determined which extends at the thus determined z-coordinate value within the closed polygon, with a direction that corresponds to that of the two-dimensional road vector.
  • a re-triangularization of the ITN may be performed in an area around the horizontal closed polygon which defines the transition area at a node of the network.
  • the re-triangularization may include defining triangular horizontal facets which, in union, cover the area enclosed by the closed polygon.
  • the re-triangularization may also include defining triangular facets in an area surrounding the transition area. The triangularization may be performed such that at least some of the edges of the closed polygon coincide with edges of triangular facets abutting on the horizontal transition area.
  • Fig. 10 shows a plan view of an ITN 80. Boundaries of triangular facets are indicated by dotted lines.
  • Information on the width of road segments is retrieved.
  • the width D of the road segments may be determined based on the retrieved information.
  • information on a road class or on a number of lanes of the road segment may be converted to a road width, using a look-up table or another description associating a road class or a number of lanes with the road width.
  • the outer boundaries of road segments may be determined.
  • the outer boundaries of road segments may be parameterized in accordance with equations (1)-(3).
  • two three-dimensional road vectors are defined for the projection of a two-dimensional road vector onto the three-dimensional surface.
  • One three-dimensional road vector has A as initial point and P i as endpoint.
  • the other three-dimensional road vector has P i as initial point and B as endpoint.
  • the road boundary includes lines extending parallel to the respective three-dimensional road vectors, but offset therefrom in a direction orthogonal to both the projection direction and the direction of the respective three-dimensional road vector.
  • road boundaries 85 and 86 extend parallel to the three-dimensional road vector from has P i to B, but are offset therefrom by ⁇ D ⁇ e r ⁇ e p , where D is half the road width, e r is the normalized vector from P i to B, and e p is a normalized vector pointing in the projection direction.
  • a width vector has an orientation along the bisecting line of the angle enclosed by the two two-dimensional road vectors.
  • Fig. 11 shows the construction of the width vector of a road segment at a node N.
  • the two-dimensional road vectors 88 and 89 enclose an angle ⁇ .
  • Fig. 12 shows a perspective view for explaining the definition of a horizontal transition area 92 and of horizontal three-dimensional road vectors 98, 99 as performed in steps 46 and 47 of the procedure 40.
  • the transition area 92 is introduced at the transition between a road segment 91 and another road segment 93 which, in the original map data base, are represented by two two-dimensional vectors arranged at an angle different from 0° and 180° relative to each other.
  • a three-dimensional road vector 94 is determined for road segment 91.
  • a three-dimensional road vector 95 is determined for road segment 92.
  • Road boundaries 96, 97 of the road segments 91, 93 may be parameterized according to equations (2) and (3), with the road half-widths being respectively given by D.
  • a corner C of the transition area 92 which also determines the z-coordinate value of the transition area, is determined as intersection point of the road boundaries 96 and 97. Based on the determined corner C, all other corners p1, p2 and E of the transition area may also be determined automatically using the following steps.
  • the corner p1 of the polygon which defines the transition area 92 is determined as endpoint of a vector which has length 2-D, is normal to both the three-dimensional road vector 94 and the projection direction (i.e., which extends parallel to the x-y-plane) and intersects the three-dimensional road vector 94.
  • the corner p2 of the polygon which defines the transition area 92 is determined as endpoint of a vector which has length 2.D, is normal to both the three-dimensional road vector 95 and the projection direction (i.e., which extends parallel to the x-y-plane) and intersects the three-dimensional road vector 95.
  • the corner E of the polygon may be determined in various ways.
  • the coordinates of corner E may be determined by adding the three-dimensional vector from C to p2 to the coordinate vector of p1.
  • the coordinates of corner E may be determined as endpoint of a vector which starts at C, has a direction along the bisecting line of the angle enclosed by the two-dimensional road vectors connected to the node (as shown in Fig. 11 ) and has a length of 2.D', with D' given by equation (4).
  • Two auxiliary three-dimensional road vectors are defined.
  • One three-dimensional road vector is defined for road segment 91 and extends from s1 to T.
  • the coordinates of s1 are obtained as the coordinates of the center of the vector from C to p1.
  • the coordinates of T are the coordinates of the center of the vector from C to E.
  • Another three-dimensional road vector is defined for road segment 93 and extends from T to s2.
  • the coordinates of s2 are the coordinates of the center of the vector from C to p2.
  • modified DTM data are generated.
  • the modified DTM data include triangles abutting on the transition area 92 which have edges coinciding with one of the edges from p1 to E or E to p2 of the transition area 92.
  • Triangular facets may be defined which describe the surface of the road segments which extends parallel to the associated three-dimensional road vector and the transition area oriented perpendicularly to the projection direction.
  • Fig. 13 illustrates the transition area in plan view to illustrate the re-triangularization.
  • the closed polygon defining the transition area has corners C, p1, E, and p2.
  • Two triangular facets may be defined which are oriented normal to the projection direction and, in union, completely cover the transition area.
  • one triangular facet with corners C, p1 and E may be defined, and another triangular facet with corners C, E and p2 may be defined.
  • the corresponding data defining the ITN having such facets may be stored as modified DTM data in the database before the database is deployed to the navigation device.
  • These triangular facets have edges 101 or 102 which extend normal both to one of the three-dimensional road vectors 94 or 95 and to the projection direction.
  • triangular facets 105 and 106 may be defined which have a boundary 103 traversing the three-dimensional road vector 94.
  • the triangular facets 105 and 106 respectively include at least a portion of the three-dimensional road vector 94.
  • One of the triangular facets 106 has an edge 101 which is normal both to the three-dimensional road vector 94 and the projection direction.
  • the other triangular facet 105 extends in the same plane as triangular facet 106.
  • triangular facets 107 and 108 may be defined which have a boundary 104 traversing the three-dimensional road vector 95.
  • the triangular facets 107 and 108 respectively include at least a portion of the three-dimensional road vector 95.
  • One of the triangular facets 107 has an edge 102 which is normal both to the three-dimensional road vector 95 and the projection direction.
  • the other triangular facet 108 extends in the same plane as triangular facet 107.
  • a horizontal junction area is determined. Determining the horizontal junction area includes determining an intersection point between road boundaries of neighbouring road segments at the node. The height-value, i.e. z-coordinate, of the intersection point determines the z-coordinate of the junction area.
  • the horizontal junction area is enclosed by a closed polygon. The intersection point is one of the corners of the closed polygon.
  • An additional three-dimensional road vector may be defined for each two-dimensional road vector connected to the junction.
  • the three-dimensional road vector may be defined such that it extends in the horizontal junction area and in a direction parallel to that of the two-dimensional road vector to which it is assigned.
  • a re-triangularization of the ITN may be performed in an area around the horizontal closed polygon which defines the junction area at the node of the network.
  • the re-triangularization may include defining triangular horizontal facets which, in union, completely cover the junction area enclosed by the closed polygon.
  • the re-triangularization may also include defining triangular facets in an area surrounding the junction area.
  • the triangularization may be performed such that at least some of the edges of the closed polygon coincide with edges of triangular facets abutting on the horizontal junction area.
  • Fig. 14 shows a plan view of a node to which, in the original map data, four two-dimensional road vectors are connected.
  • the two-dimensional road vectors represent road segments 111-114.
  • three-dimensional road vectors 115-118 are determined. Based on the road widths of the road segments, boundaries of the road segments may be computed which may be parameterized in accordance with equation (1).
  • Intersection points between the outer road boundaries are determined. This may be done by computing the intersection point using of two lines parameterized by equation (1). These intersection points are indicated by Sa in Fig. 14 .
  • a line is determined which intersects a three-dimensional road vector of an adjacent road segment and is normal to both the three-dimensional road vector determined for this road segment and the projection direction.
  • the intersection points of the thus determined lines with the opposite outer road boundaries define additional corners of the polygon.
  • the line 123 extends from the intersection point Sa between road segments 111 and 112 such that it is normal to the three-dimensional road vector 116 and the projection direction.
  • the line 123 intersects the opposing outer road boundary of the road segment 112 at a point Sb. Similar points (without reference numerals) obtained by intersecting lines which are perpendicular to the projection direction and perpendicular to one of the three-dimensional road vectors with the opposing outer road boundary are also shown in Fig. 14 .
  • junction area enclosed by the polygon having edges 123, 127, 124, 128, 125, 129 and 126 extends normal to the projection direction.
  • the z-coordinate of the junction area is determined by one of the intersection points, e.g., by the z-coordinate of the intersection point Sa between outer road boundaries of the road segments 111 and 112.
  • a three-dimensional road vector may be determined which extends within the junction area JA, i.e., in a direction normal to the projection direction.
  • the three-dimensional road vector may respectively be selected such that, within the plane of the junction area JA, it is parallel to the two-dimensional road vector for which it is determined.
  • Fig. 15 illustrates the determining of these three-dimensional road vectors.
  • the points s1-s4 at which the three-dimensional road vector 115-118 respectively intersect one of the edges of the closed polygon defining the junction area JA is determined.
  • a straight line 135-138 which extends within the horizontal junction area JA is determined.
  • the straight lines 135-138 respectively extend in a direction perpendicularly to the projection direction and parallel to one of the two-dimensional road vectors connected to the junction node.
  • the intersection point J of the straight lines 135-138 is determined.
  • a three-dimensional road vector having initial point s1 and endpoint J is determined.
  • corresponding three-dimensional road vectors may be determined for each one of the two-dimensional road vectors connected to the junction node.
  • the three-dimensional road vectors 115-118 which are not required to extend horizontally are re-defined such that they terminate at the point s1-s4 where the respective three-dimensional road vector 115-118 intersects the horizontal junction area JA.
  • the thus determined three-dimensional road vectors 115-118 and 135-138 are stored in the database.
  • Fig. 16 illustrates the re-triangularization in a neighbourhood of the junction area.
  • the closed polygon defining the junction area JA may be split up into plural triangular facets, each being oriented so as to be perpendicular to the projection direction.
  • the corresponding data defining the ITN having such triangular facets are stored as modified DTM data in the database before the database is deployed to the navigation device.
  • At least some of the triangular facets which define the junction area JA have an edge which extends normal to both the projection direction and the three-dimensional road vector determined for one of the two-dimensional road vectors connected to the junction node.
  • Additional triangular facets may be defined for road areas RA.
  • Such triangular facets may cover a road area RA extending along a three-dimensional road vector and having a width, in the direction transverse to the three-dimensional road vector, which is determined by the width information for the respective road segment.
  • a triangular facet 143 may be defined which includes at least a portion of the three-dimensional road vector 117.
  • the triangular facet 117 has an edge which is normal both to the three-dimensional road vector 117 and the projection direction.
  • Similar triangular facets may be defined for the other road segments, in the same way as described with reference to Figs. 12 and 13 .
  • the triangular facets of the ITN in the neighbourhood of the junction area may also be re-defined.
  • a triangular facet 142 may be defined.
  • the triangular facet 142 has an edge 127 which is one of the edges of the planar polygon enclosing the junction area.
  • the triangular facet 142 has another edge which corresponds to an outer boundary of a road segment and is parallel to the three-dimensional road vector 117.
  • a re-triangularization of the DTM may be performed along the three-dimensional road vectors for areas which have not previously been re-triangularized at 47 or 49, respectively.
  • This re-triangularization may be performed similarly as described with reference to Fig. 12 , Fig.13 and Fig.16 .
  • Triangular facets defining the road surface may be defined. Such triangular facets extend in a rectangular planar surface which includes the respective three-dimensional road vector and which has an edge that is perpendicular to both the projection direction and the respective three-dimensional road vector.
  • the width of the rectangular planar surface, measured in a direction normal to the three-dimensional road vector may be determined based on information on the road width for the respective road segment.
  • the rectangular planar surface may be partitioned into two or more triangular facets.
  • the ITN may also be re-defined so as to ensure consistency with the three-dimensional road vectors.
  • Triangular facets may be defined which abut on the triangular facets defined for the road surface.
  • Such triangular facets which define the terrain surrounding the road segment may have an edge which extends along an outer boundary of the road segment, which may be parameterized according to equation (1).
  • Data representing the thus re-triangularized ITN may also be stored in the database.
  • a perspective view of the terrain which abuts on the road segment is generated in a manner which is consistent with the perspective view of the road segment(s) generated based on the three-dimensional road vectors.
  • determining three-dimensional road vectors according to any one of the methods described herein may be performed repeatedly for different levels of details (and thus for different scales) at which the three-dimensional map is to be output.
  • certain parameters such as a threshold used to discard intermediate points of a projection on the three-dimensional surface as explained with reference to Figs. 6-9 may be set to different values for the different levels of detail.
  • the various sets of three-dimensional road vectors determined may be stored in the database.
  • the various sets of three-dimensional road vectors may respectively stored in the layer which corresponds to the respective level of detail for which the three-dimensional road vectors were determined.
  • Embodiments of the invention may be used for generating databases for use in navigation devices and for outputting three-dimensional maps via an optical output device of a navigation device.

Claims (11)

  1. Verfahren zum Erzeugen einer Datenbank (10) für eine Navigationsvorrichtung (1), wobei das Verfahren die folgenden Schritte umfasst, die durchgeführt werden, bevor die Navigationsvorrichtung (1) zur Benutzung beim Erzeugen perspektivischer Ansichten eingesetzt wird:
    Abrufen einer Mehrzahl zweidimensionaler Straßenvektoren (66; 88, 89) aus einer Kartendatenbank, wobei jeder der zweidimensionaler Straßenvektoren (66; 88, 89) ein Straßensegment eines Straßennetzes definiert;
    Abrufen digitaler Geländemodelldaten, die eine dreidimensionale Oberfläche (80) definieren;
    für jeden zweidimensionaler Straßenvektor (66; 88, 89) der abgerufenen Mehrzahl von zweidimensionaler Straßenvektoren (66; 88, 89):
    Erstellen einer Projektion (72, 73) des zweidimensionaler Straßenvektors (66; 88, 89) auf die dreidimensionale Oberfläche (80) in einer vorgegebenen Projektionsrichtung (71);
    Bestimmen von wenigstens einem dreidimensionalen Straßenvektor (78, 79; 81-83; 94, 95, 98, 99; 115-118, 135-138) auf Grundlage der erstellten Projektion (72, 73), wobei der wenigstens eine dreidimensionale Straßenvektor (78, 79; 81-83; 94, 95, 98, 99; 115-118, 135-138) Höheninformationen für Punkte aufweist, die an dem wenigstens einem dreidimensionalen Straßenvektor (78, 79; 81-83; 94, 95, 98, 99; 115-118, 135-138) angeordnet sind; und Speichern des wenigstens einen dreidimensionalen Straßenvektors (78, 79; 81-83; 94, 95, 98, 99; 115-118, 135-138) in der Datenbank (10); und
    Erzeugen modifizierter digitaler Geländemodelldaten auf Grundlage der digitalen Geländemodelldaten und auf Grundlage des bestimmten wenigstens einen dreidimensionalen Straßenvektors (78, 79; 81-83; 94, 95, 98, 99; 115-118, 135-138), um einen nahtlosen Übergang zwischen Straßensegmenten und umgebendem Gelände sicherzustellen, wenn die Navigationsvorrichtung (1) eine dreidimensionale Karte ausgibt, wobei die modifizierten digitalen Geländemodelldaten in der Datenbankbank (10) gespeichert werden, bevor die Datenbank (10) in der Navigationsvorrichtung (1) eingesetzt wird;
    wobei das Erzeugen der modifizierten digitalen Geländemodelldaten Folgendes einschließt:
    Bestimmen, für mehrere der bestimmten dreidimensionalen Straßenvektoren (78, 79; 81-83; 94, 95, 98, 99; 115-118, 135-138), einer Dreieckfacette (104-108), in der sich der jeweilige dreidimensionale Straßenvektor (78, 79; 81-83; 94, 95, 98, 99; 115-118, 135-138) erstreckt und die eine Kante (101, 102) senkrecht sowohl zu dem dreidimensionalen Straßenvektors(78, 79; 81-83; 94, 95, 98, 99; 115-118, 135-138) als auch zur Projektionsrichtung (71) aufweist.
  2. Verfahren nach Anspruch 1,
    wobei das Bestimmen des wenigstens einen dreidimensionalen Straßenvektors (78, 79; 81-83; 94, 95, 98, 99; 115-118, 135-138) Folgendes einschließt:
    Bestimmen, für mehrere Zwischenpunkte (P1-P4), die an der Projektion (72, 73) angeordnet sind, eines jeweiligen Abstands des Zwischenpunkts (P1-P4) von einer Geraden (74), die durch einen Ausgangspunkt (A) der Projektion (72, 73) und einen weiteren Punkt (B) der Projektion (72, 73) verläuft, wobei der Ausgangspunkt (A) und der weitere Punkt (B) der Projektion (72, 73) jeweils ein Koordinaten-3-Tupel aufweisen, das an der dreidimensionalen Oberfläche (80) angeordnet ist.
  3. Verfahren nach Anspruch 2,
    wobei jeweils ein Schwellenwertvergleich für den Abstand durchgeführt wird und der wenigstens eine dreidimensionale Straßenvektor (78, 79; 81-83; 94, 95, 98, 99; 115-118, 135-138) auf Grundlage des Schwellenwertvergleichs bestimmt wird.
  4. Verfahren nach Anspruch 3,
    wobei mehr als ein dreidimensionaler Straßenvektor (78, 79; 81-83; 94, 95, 98, 99; 115-118, 135-138) selektiv für einen zweidimensionalen Straßenvektor (66, 88, 89) bestimmen wird, wenn der Abstand für einen Zwischenpunkt (P1-P4) größer als der Schwellenwert ist.
  5. Verfahren nach einem der Ansprüche 2-4,
    wobei die dreidimensionale Oberfläche (80), die von den digitalen Geländemodelldaten definiert wird, eine Mehrzahl von Facetten (61-65) aufweist,
    und
    wobei die mehreren Zwischenpunkte (P1-P4) Punkte (P1-P4) der Projektion (72, 73) aufweisen, die an Grenzen zwischen Facetten (61-65) angeordnet sind.
  6. Verfahren nach einem der vorangehenden Ansprüche,
    wobei Informationen zu einer Straßenbreite (D) jeweils aus der Mehrzahl von zweidimensionalen Straßenvektoren (66, 88, 89) abgerufen werden,
    und
    wobei der wenigstens eine dreidimensionale Straßenvektor (78, 79; 81-83; 94, 95, 98, 99; 115-118, 135-138) und das modifizierte digitale Geländedatenmodell auf Grundlage der Informationen zu einer Straßenbreite (D) bestimmt werden.
  7. Verfahren nach einem der vorangehenden Ansprüche,
    wobei das Erzeugen des modifizierten digitalen Geländedatenmodells Folgendes einschließt:
    Identifizieren von Knoten (T) des Straßennetzes, mit denen jeweils wenigstens ein erster zweidimensionaler Straßenvektor (88) und ein zweiter zweidimensionaler Straßenvektor (89) der Mehrzahl zweidimensionaler Straßenvektoren (88; 89) verbunden ist, und
    für jeden der identifizierten Knoten, Identifizieren eines planaren Vielecks, das senkrecht zur Projektionsrichtung (71) ausgerichtet ist, derart, dass ein erster dreidimensionaler Straßenvektor (98; 135), der für den ersten zweidimensionalen Straßenvektor bestimmt wird, und ein zweiter dreidimensionaler Straßenvektor (99; 136), der für den zweiten zweidimensionalen Straßenvektor bestimmt wird, in dem Polygon angeordnet werden.
  8. Verfahren nach Anspruch 7,
    wobei eine Ecke (C; Sa) des Vielecks durch Berechnen von drei Raumkoordinaten eines Schnittpunkts einer ersten Straßengrenze (96; 121), die für den ersten zweidimensionalen Straßenvektor (66; 88, 89) bestimmt wurde, und einer zweiten Straßengrenze (97; 122), die für den zweiten zweidimensionalen Straßenvektor bestimmt wurde, bestimmt wird.
  9. Verfahren nach Anspruch 7 oder Anspruch 8,
    wobei eine Untergruppe von Kanten (101, 102; 123-126) des Vielecks jeweils derart ausgerichtet ist, dass jede Kante (101, 102; 123-126) der Untergruppe zur Projektionsrichtung (71) und zu jeweils einem der dreidimensionalen Straßenvektoren (94, 95, 98, 99; 115-118; 135-138), die in dem Bereich angeordnet sind, der von dem Vieleck definiert wird, senkrecht ist oder das Vieleck schneidet.
  10. Verfahren nach einem der Ansprüche 7-9,
    wobei die Knoten, für die das planare Vieleck senkrecht zur Projektionsrichtung (71) bestimmt wird, Straßenkreuzungen einschließen, mit denen mehr als zwei zweidimensionale Straßenvektoren verbunden sind.
  11. Verfahren nach einem der vorangehenden Ansprüche,
    wobei die Datenbank eine relationale Datenbank (10) ist.
EP20110168539 2011-06-01 2011-06-01 Verfahren zur Erzeugung einer Datenbank für eine Navigationsvorrichtung Active EP2530433B1 (de)

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CN201280026885.1A CN103562681B (zh) 2011-06-01 2012-05-31 产生用于导航装置的数据库的方法、输出三维地图的方法和导航装置
US14/122,843 US9574897B2 (en) 2011-06-01 2012-05-31 Method of generating a database for a navigation device, method of outputting a three-dimensional map, and navigation device
PCT/EP2012/060232 WO2012164010A1 (en) 2011-06-01 2012-05-31 Method of generating a database for a navigation device, method of outputting a three-dimensional map, and navigation device

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US9574897B2 (en) 2017-02-21

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